Helene J. Jordan. (1992). How a Seed Grows (Let's-Read-and-Find-Out Science 1) (Revised ed.). HarperCollins.
Cita Chicago (17th ed.)Helene J. Jordan. How a Seed Grows (Let's-Read-and-Find-Out Science 1). Revised ed. HarperCollins, 1992.
Cita MLA (9th ed.)Helene J. Jordan. How a Seed Grows (Let's-Read-and-Find-Out Science 1). Revised ed. HarperCollins, 1992.
Atenció: Aquestes cites poden no estar 100% correctes.